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Agronomy
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Optimal Control of Light Conditions to Maximize Plant Production in...
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Optimal Control of Light Conditions to Maximize Plant Production in Protected Cultivation

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Horticultural and Floricultural Crops".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 780

Special Issue Editors

Prof. Dr. Seung Jae Hwang

E-Mail Website
Guest Editor
Division of Horticultural Science, College of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea
Interests: protected horticulture; seedling production; vertical farm
Prof. Dr. Yurina Kwack

E-Mail Website
Guest Editor
Department of Environmental Horticulture, University of Seoul, Seoul 02504, Republic of Korea
Interests: optimal crop production in a greenhouse and vertical farm; grafted seedling production; crop growth modelling

Special Issue Information

Dear Colleagues,

In crop production, light plays a critical role in regulating growth and development. In protected cultivation, the establishment of an optimal light condition is directly correlated with crop yields. A variety of strategies can be employed to assist in the effective management of light conditions throughout the day and season.

This Special Issue incorporates a series of research papers that address the control of the optimal light environment in protected horticulture from a variety of perspectives, with the objective of enhancing crop quantity and quality. Also, it covers following topics: temperature and irrigation control in conjunction with optimal light regulation to minimize crop stress and maximize photosynthesis and growth modeling to account for changes in light intensity.

Prof. Dr. Seung Jae Hwang
Prof. Dr. Yurina Kwack
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Agronomy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • crop growth model
  • environment control
  • light use efficiency (LUE)
  • supplemental light
  • control of natural light

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Published Papers (1 paper)

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Research

15 pages, 1812 KiB  
Article
Enhancing the Photon Yield of Hydroponic Lettuce Through Stage-Wise Optimization of the Daily Light Integral in an LED Plant Factory
by Ruimei Yang, Hao Yang, Fang Ji and Dongxian He
Agronomy 2024, 14(12), 2949; https://doi.org/10.3390/agronomy14122949 - 11 Dec 2024
Viewed by 577
Abstract
The widespread application of LED plant factories has been hindered by the high energy consumption and low light use efficiency. Adjustment of the daily light integral (DLI) offers a promising approach to enhance the light use efficiency in hydroponic cultivation within LED plant [...] Read more.
The widespread application of LED plant factories has been hindered by the high energy consumption and low light use efficiency. Adjustment of the daily light integral (DLI) offers a promising approach to enhance the light use efficiency in hydroponic cultivation within LED plant factories. However, most LED plant factories use a constant DLI during the cultivation process, which often leads to excessive light intensity in the early growth stage and insufficient light intensity in the later stage. To address this issue, this study aimed to improve the photon yield of hydroponic lettuce by optimizing the DLI at different growth stages. A logistic growth model was employed to segment the lettuce growth process, with variable DLI levels applied to each stage. DLIs of 11.5, 14.4, and 18.0 mol m−2·d−1 were implemented at the slow growth stage, and the DLIs were adjusted to 14.4, 17.3, and 21.2 mol m−2·d−1 at the rapid growth stage. Photoperiods of 16 h·d−1 and 20 h·d−1 were used for the two growth stages, and LED lamps with white and red chips (ratio of red to blue light was 1.5) were used as the light source. The results indicated that the photoperiod had no significant impact on the shoot fresh weight and photon yield under the constant DLI conditions at the slow growth stage (12 days after transplanting). The 14.4 mol m−2·d−1 treatment resulted in the highest photon yield due to the significant increases in the light absorption and net photosynthetic rate of the leaves compared to the 11.5 mol m−2·d−1 treatment. No significant differences in the specific leaf area (SLA) and leaf light absorption were observed between the 14.4 and 18.0 mol m−2·d−1 treatments; however, the photon yield and actual photochemical efficiency (ΦPSII) significantly decreased. Compared with the DLI of 14.4 mol m−2·d−1 at the rapid growth stage (24 days after transplanting), the 17.3 mol m−2·d−1 treatment with 20 h·d−1 increased the leaf light absorption by 5%, the net photosynthetic rate by 35%, the shoot fresh weight by 25%, and the photon yield by 19%. However, the treatments with DLIs above 17.3 mol m−2·d−1 resulted in notable decreases in the photon yield, ΦPSII, and photosynthetic potential. In conclusion, it is recommended to implement a 20 h·d−1 photoperiod coupled with a DLI of 14.4 mol m−2·d−1 for the slow growth stage and 17.2 mol m−2·d−1 for the rapid growth stage of hydroponic lettuce cultivation in an LED plant factory. Full article
(This article belongs to the Special Issue Optimal Control of Light Conditions to Maximize Plant Production in Protected Cultivation)
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